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Tension or Temperature. Dogs may shake as a way of relieving tension. If a dog is feeling nervous or uncomfortable in a situation, it might shake the whole body as a way of shaking out tension. This behavior also may function as a means of getting attention from other dogs or people.
Full Body Shaking and Seizures. Dogs can have seizures for a number of reasons. Rabid dogs will suffer from seizures. If your pet has been bitten by a wild animal or bat and you are uncertain of the date of your dog's last rabies shot, rabies is a possibility.